Question

Factorise the following expressions :​

Answer 1

(l² + 2m²)²

Explanation:

l⁴ + 4l²m² + 4m⁴

=(l²)² + 2 x l² x 2m²+ (2m²)²

Now this is in the form of (a + b)² = a² + 2ab + b² so we get

= (l² + 2m²)²

Answer 2

(l²+2m²)²

Explanation:

to understand this

you need to know about:

• factoring

tips and formulas:

• (a+b)²=a²+2ab+b²

let's solve:

1. rewrite:(l²)²+2.l².2m²+(2m²)²
2. use the formula:(l²+2m²)²